linux-kernel - [patch 4/6] mm: comment mmap_sem / lock

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Date:	Fri, 13 Oct 2006 18:44:32 +0200 (CEST)
From:	Nick Piggin <npiggin@...e.de>
To:	Linux Memory Management <linux-mm@...ck.org>
Cc:	Neil Brown <neilb@...e.de>, Andrew Morton <akpm@...l.org>,
	Anton Altaparmakov <aia21@....ac.uk>,
	Chris Mason <chris.mason@...cle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>
Subject: [patch 4/6] mm: comment mmap_sem / lock_page lockorder

Add a few more examples to the mmap_sem / lock_page ordering.

Signed-off-by: Nick Piggin <npiggin@...e.de>

Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -73,7 +73,7 @@ generic_file_direct_IO(int rw, struct ki
  *        ->mapping->tree_lock	(arch-dependent flush_dcache_mmap_lock)
  *
  *  ->mmap_sem
- *    ->lock_page		(access_process_vm)
+ *    ->lock_page		(page fault, sys_mmap, access_process_vm)
  *
  *  ->mmap_sem
  *    ->i_mutex			(msync)
Index: linux-2.6/mm/rmap.c
===================================================================
--- linux-2.6.orig/mm/rmap.c
+++ linux-2.6/mm/rmap.c
@@ -29,7 +29,7 @@
  * taken together; in truncation, i_mutex is taken outermost.
  *
  * mm->mmap_sem
- *   page->flags PG_locked (lock_page)
+ *   page->flags PG_locked (lock_page, eg from pagefault)
  *     mapping->i_mmap_lock
  *       anon_vma->lock
  *         mm->page_table_lock or pte_lock
-
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